78207645 has 16 divisors (see below), whose sum is σ = 125413632. Its totient is φ = 41616960.

The previous prime is 78207643. The next prime is 78207697. The reversal of 78207645 is 54670287.

It is not a de Polignac number, because 78207645 - 2¹ = 78207643 is a prime.

It is a super-2 number, since 2×78207645² = 12232871472892050, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78207641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1315 + ... + 12575.

It is an arithmetic number, because the mean of its divisors is an integer number (7838352).

Almost surely, 2^78207645 is an apocalyptic number.

It is an amenable number.

78207645 is a deficient number, since it is larger than the sum of its proper divisors (47205987).

78207645 is a wasteful number, since it uses less digits than its factorization.

78207645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11732.

The product of its (nonzero) digits is 94080, while the sum is 39.

The square root of 78207645 is about 8843.5086362823. The cubic root of 78207645 is about 427.6446759054.

The spelling of 78207645 in words is "seventy-eight million, two hundred seven thousand, six hundred forty-five".